I'm a type 1 and I have been very fortunate with my control over the (more than 20) years. I started self-regulating long before DAFNE and have remained on injections as I can't see the benefit of changing to a pump at the moment. I've managed to do multiday bikepacking events, 12 hour races (as part of a team admittedly) and run the London Marathon twice so it works for me. I'm not a super athlete by any means but sadly I don't think I can blame my diabetes solely for that!
Please feel free to ignore my account as it may not be applicable when using a pump. However, I use Levemir (equivalent to your basal insulin) each night, the dose of which I adjust depending on my exercise during the day(s). My 'typical' dose might be 15 units following a slothful Saturday, but if I were to go for a ride I would change that to perhaps 13.5 units to prevent night time hypos. I would also reduce the pre-meal injections of fast acting insulin (Actrapid) following exercise. I find consecutive days of exercise will have a increased affect (i.e. further reduction in basal and pre-meal insulin) but the effects only last for about 24 hours after my last spell of exercise.
During rides I don't find I have to eat a huge amount to keep my blood glucose stable. A little snack every so often but rarely any more than my riding buddies to be honest. If an all-dayer then lunch will require only a small pre-meal insulin injection.
I hope you manage to get things back on track soon. I've had little spells where things have gone awry which I've put down to perhaps a change in insulin, a duff batch or maybe a virus. Occasionally I've had to do regular tests to get to the bottom of it but have managed to in the end.